Adjustable gas-engine piston.



W. L. SCHOENGARTH.

ADJUSTABLE GAS ENGINE PISTON.

APPLICATION FILED ,OCT. I, 1915;

Patented Mar. 7,1916;

2 SHEETS-SHEETI W. L, SCHOENGARTH.

ADJUSTABLE GAS ENGINE PISTON.

APPLICATION FILED OCT. 1, 1915.

L1 a Patentd Mar. 7,1916.

2 SHEETS-SHEETZ.

WALTER L. SCHOENGARTH, F IRONWOOD, MICHIGAN.

ADJUSTABLE GAS-ENGINE PISTON.

Specification of Letters Patent.

Patented Mar. 7, 1916.

Application filed. October 1, 1915. SeriaI'No. 53,625.

To all whom it may concern:

Beit known that I, WALTER L. ScHoEN- GARTH, a citizen of the United States, residaccording to rule,

ing at Ironwood, in the county of Gogebic and State of Michigan, have invented certain new and useful Improvements in Ad justable Gas-Engine Pistons, of which the following is a specification.

My invention relates to an adjustable gas engine piston, the object being to prevent what is called a piston knock and flutter, and in my presentinvention provision is made for adjusting the size of the. piston so that it can be made to last the lifetime of the motor. The result is, it is quiet, and without knock or flutter, thus rendering re-boring and new pistons unnecessary, prolonging the life and usefulness of the motor, and greatly reducing the cost of repair, etc.

My improved piston can be ground according to the ideas of the repairman or builder, doing away with all rough surfaces, after which it may be adjusted to a perfect fit in the cylinder-bore.

With these objects in view, my present invention comprises a piston which is transversely and diagonally slotted on one side, with means inside for expanding the piston to fit perfectly the bore of the cylinder.

It further consists in bushings for the cross-head pin, which are capable of quick and accurate adjustment to take up wear.

In the accompanying drawings: Figure 1 is a view of the-motor in vertical section,

showingthe position of piston; Fig. 2 is a side elevation of the piston; Fig. 3 is a sectional view on the line 33 of Fig. 2'; Fig. 4 is an end view looking into the piston; and Fig. 5 is a viewof the wrench for adjusting nuts.

A, represents the piston, it being provided withthe circumferential ring-grooves 1, 1, adapted to receive packing-rings, and ring pins 2 are provided in these grooves to preventthe rings from shifting. The plston has two slots, namely a transverse slot- 3 out nearly half-way thereacross on one side, and at each end of which a small hole 3 is drilled, and a diagonal slot 4 extending from the point near the .center of the transverse slot 3 to one end of the piston. This slot is cut diagonally for two pusposes, first, to prevent scar, and second, for convenience in making the upper and lower piston adjustment. The piston adjustment is taken up in two places, namely at the upper endof the diagonal slot and also at the lower end. The adjustment is through the two screws or studs 5 and 5 which turn in threaded orifices in the lugs C and D located at the upper and lower ends respectively of the piston, the inner ends of these screws or studs turning in the holes in the abutmentsEand F respectively. Access is gained to these screws by a screw-driver inserted through the holes H and I respectively, and jam-nuts 6 on these'screws or studs have notched edges to receive the wrench 13 by which they are turned up tight by the lock-washers 7 against the lugs C and D. To expand the piston to the size required, the nuts are loosened, and the screws are turned in the lugs to get the re quired expansion, after which the jam-nuts are tightened up against the lugs, and in this way the piston may be re-fitted to the bore of the cylinder at any time without the necessity of re-boring or the purchase and substitution of new pistons. In fact this adjustment may be accomplished without removing the piston from the cylinder.

The ends of the cross-head pin 12 are supported in cross-head bushings 9, 9. These arevpreferably made of bronze or brass, and

split longitudinally, having an external ta- I per so that they are compressible around the ends of the cross-head pins by means of the take-up bushing nuts 8 at either end, and a cotter-pin 10 is inserted to hold the bushing nut 8 against turning. It is evident that a plain bushing, such as shown in 11, might be used instead of a tapering, adjustable one as described. The bushing-seats 14 are preferably reinforced at top of piston, as shown in Fig. 3. The piston is placed in the motor, as shown in. Fig. 1, that is to say with the solid side of the piston toward the expansion wall or the side of cylinder where the explosion or combustion takes place and forces the piston against the cylinder wall on the power stroke, thus bringing the slots 3 and 1 on the right side of the engine.

Obviously more or less slight changes might be made in the form and arrangement of the several parts described without departing from the spirit and scope of my invention, and hence I do not wish to limit myself to the exact construction herein set .forth, but

I claim: 1. An expansible piston having a transverse and longitudinal slot therethrough,

and adjustable locking means located internally for expanding the piston. 2. A piston transversely and longitudlnally slotted, and screws supported on one side of the longitudinal slot and engaging a ,member on the opposite side thereof,

na-lly slotted, and screws supported on one side of the longitudinal slot and engaging a -member on the opposite side thereof, whereby when turned in one direction the piston is expanded, and when turned in the opposite direction it contracts by its own elasticity, and means for lockingsaid adjusting means,

LA piston transversely and longitudi nally slotted, andehaving holes therethrough onone side of the longitudinal slot, lugs and abutments located on opposite sides of the longitudinal slots and having orifices therein in alinement with the holes, in the pistons, and screws extending through said orifices in the lugs and abutments, accessible through holes in the piston, for adjusting the piston.

5, A piston transversely and longitudinally slotted, and. having holes therethrough the piston, and lock-nuts located on the screws on opposite sides of-the lugs for lock ing the screw against turning to hold the piston in its adjusted position.

6. The combination'with a piston, of a cross-head pin, a tapering adjustable bushing, and a'take-up bushing-nut for moving the bushing endwise and contracting it around the cross-head pin.

7. The combination with a piston, of a cross-head pin, a tapering adjustable bushing, and a take-up bushing-nut for moving the bushing endwise and contracting it around the cross-head pin, the bushing-nut externally screw-threaded to turn in a,

threaded orifice concentric with the outer end of the bushing, and means for locking the bushing-nut against turning.

In testimony whereof I afiix my signature.

WALTER L. SCHOENGABTH. 

